XC164CS datasheet(45/71 Pages) INFINEON

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XC164

Derivatives

Functional Description

Data Sheet

V2.1, 2003-06

3.17

Power Management

The XC164 provides several means to control the power it consumes either at a given

time or averaged over a certain timespan. Three mechanisms can be used (partly in

parallel):

• Power Saving Modes switch the XC164 into a special operating mode (control via

instructions).

Idle Mode stops the CPU while the peripherals can continue to operate.

Sleep Mode and Power Down Mode stop all clock signals and all operation (RTC may

optionally continue running). Sleep Mode can be terminated by external interrupt

signals.

• Clock Generation Management controls the distribution and the frequency of

internal and external clock signals. While the clock signals for currently inactive parts

of logic are disabled automatically, the user can reduce the XC164’s CPU clock

frequency which drastically reduces the consumed power.

External circuitry can be controlled via the programmable frequency output FOUT.

• Peripheral Management permits temporary disabling of peripheral modules (control

via register SYSCON3). Each peripheral can separately be disabled/enabled.

The on-chip RTC supports intermittend operation of the XC164 by generating cyclic

wake-up signals. This offers full performance to quickly react on action requests while

the intermittend sleep phases greatly reduce the average power consumption of the

system.

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